const processWithResourceAccess = process as NodeJS.Process & {

_getActiveHandles?: () => unknown[];

_getActiveRequests?: () => unknown[];

getActiveResourcesInfo?: () => string[];

};

const activeHandles = processWithResourceAccess._getActiveHandles?.();

const activeRequests = processWithResourceAccess._getActiveRequests?.();

const activeResources = processWithResourceAccess.getActiveResourcesInfo?.();

const metrics: Array<readonly [string, number]> = [

["processSigintListenersCount", process.listenerCount("SIGINT")],

["processSigtermListenersCount", process.listenerCount("SIGTERM")],

["processSigusr1ListenersCount", process.listenerCount("SIGUSR1")],

];

if (activeHandles) {

metrics.push(["activeHandlesCount", activeHandles.length]);

metrics.push(["activeTimersCount", countActiveTimers(activeHandles)]);

}

if (activeRequests) {

metrics.push(["activeRequestsCount", activeRequests.length]);

}

const activeTimersCount = activeResources

? countActiveTimersFromResourceInfo(activeResources)

: activeHandles

? countActiveTimersFromHandles(activeHandles)

: undefined;

if (activeTimersCount !== undefined) {

metrics.push(["activeTimersCount", activeTimersCount]);

}

return metrics.length > 0 ? metrics : null;

}

function countActiveTimers(activeHandles: readonly unknown[]): number {

function countActiveTimersFromResourceInfo(activeResources: readonly string[]): number {

return activeResources.filter((resource) => resource === "Timeout" || resource === "Timer")

.length;

}

function countActiveTimersFromHandles(activeHandles: readonly unknown[]): number {

let count = 0;

for (const handle of activeHandles) {

if (typeof handle !== "object" || handle === null) {